Toner Particle Structure for Hot Offset and Abrasion Resistance
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Solution Overview
Problem
Existing toners with inorganic fine particles exhibit insufficient abrasion resistance in low-toner laid-on areas while maintaining high hot offset resistance, leading to image peeling during friction.
Innovation Solution
A toner formulation with specific structural domains of inorganic fine particles, such as CaCO3, BaSO4, Mg3Si4O10(OH)2, and Al2Si2O5(OH)4, distributed within a binder resin, where the inorganic fine particle domain area ratio and dispersion diameter are controlled to balance hot offset resistance and abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic fine particles are added to toner particles to enhance hot offset resistance, then hot offset resistance is improved, but abrasion resistance in low toner laid-on level areas deteriorates
Solution Approach 1:
The invention applies local quality by creating specific inorganic fine particle domains with controlled size (2.0 times or more of primary particle diameter) and distribution (0.5-10.0% area ratio) within the toner particle. This localized clustering of inorganic particles provides enhanced hot offset resistance at critical locations while maintaining overall abrasion resistance, resolving the contradiction between these two properties.
Solution Approach 2:
The invention changes the parameter of inorganic fine particle domain size relative to primary particle diameter, requiring the domain size to be at least 2.0 times the primary particle diameter. This parameter change optimizes the balance between hot offset resistance (enhanced by inorganic particle filler effect) and abrasion resistance (maintained by controlled domain structure), directly addressing the technical contradiction.
2Reliability
If inorganic fine particles are added to toner particles to reduce cost and improve physical properties, then hot offset resistance is enhanced, but image quality in low toner laid-on level areas deteriorates
Solution Approach 1:
The invention applies local quality by creating specific inorganic fine particle domains with controlled size (2.0 times or more of primary particle diameter) and distribution (0.5-10.0% area ratio) within the toner particle. This localized clustering of inorganic particles provides enhanced hot offset resistance at critical locations while maintaining overall abrasion resistance, resolving the contradiction between these two properties.
Solution Approach 2:
The invention changes the parameter of inorganic fine particle domain size relative to primary particle diameter, requiring the domain size to be at least 2.0 times the primary particle diameter. This parameter change optimizes the balance between hot offset resistance (enhanced by inorganic particle filler effect) and abrasion resistance (maintained by controlled domain structure), directly addressing the technical contradiction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The toner achieves enhanced abrasion resistance and hot offset resistance by leveraging the lubricating action of detached inorganic fine particles and filler effects, maintaining image integrity under friction.
Implementation Method 1
an inorganic fine particle domain A having dispersion diameter of 2.0 times or more of Dc is present in the cross section... a sum of areas occupied by the inorganic fine particle domain A in the cross section is denoted by SA... the toner achieves excellent abrasion resistance and hot offset resistance by utilizing inorganic fine particle domains that reduce friction
Implementation Method 2
Such inorganic fine particle is also called an extender pigment, which is used for the purpose of improving a physical property of a material to be added, reducing the cost... By adding such an inorganic fine particle to a toner particle, there is a possibility that a hot offset resistance, which is obtained by a filler effect, of a toner is enhanced
Data Source
AI summary
A toner including a toner particle which contains: a resin component containing a binder resin; and an inorganic fine particle, the inorganic fine particle is at least one inorganic fine particle selected from the group consisting of (i) a particle containing CaCO3, (ii) a particle containing BaSO4, (iii) a particle containing Mg3Si4O10(OH)2, and (iv) a particle containing Al2Si2O5(OH)4, a number average particle diameter Dc of a primary particle of the inorganic fine particle is 100 nm or more and 1000 nm or less, when a cross section of the toner particle is observed, an inorganic fine particle domain A having a dispersion diameter of 2.0 times or more of Dc is present in the cross section, and the inorganic fine particle and the inorganic fine particle domain A occupy a specific percentage of an area in the cross section of the toner particle.